title: Two-photon quantum interference in integrated multi-mode interference devices.
abstract: Multi-mode interference (MMI) devices fabricated in silicon oxynitride (SiON) with a refractive index contrast of 2.4% provide a highly compact and stable platform for multi-photon non-classical interference. MMI devices can introduce which-path information for photons propagating in the multi-mode section which can result in degradation of this non-classical interference. We theoretically derive the visibility of quantum interference of two photons injected in a MMI device and predict near unity visibility for compact SiON devices. We complement the theoretical results by experimentally demonstrating visibilities of up to 97.7% in 2×2 MMI devices without the requirement of narrow-band photons.
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Poulios
authors.forename: Daniel
authors.initials: D
authors.lastname: Fry
authors.forename: Alberto
authors.initials: A
authors.lastname: Politi
authors.forename: Nur
authors.initials: N
authors.lastname: Ismail
authors.forename: Kerstin
authors.initials: K
authors.lastname: Wörhoff
authors.forename: Jeremy L
authors.initials: JL
authors.lastname: O'Brien
authors.forename: Mark G
authors.initials: MG
authors.lastname: Thompson